SF-98-15-2 (RP-725) -- Ammonia Spray Evaporation Heat Transfer Performance of Single Low-Fin and Corrugated Tubes (same as 4109)

Conference Proceeding by ASHRAE, 1998

Xin Zeng, Ming Chyu, Zahid H. Ayub

Full Description

Evaporation of liquid ammonia distributed by commercial spray nozzles onto a horizontal low-fin steel tube of 3/4 in. diameter was tested. Experiments were conducted for the average local spray flow rate from 0.0139 kg/(s•m) to 0.0788 kg/(s•m), saturation temperature from -23.3°C to 10°C, and heat flux from 10 kW/m2 to 80 kW/m2. The effects of heat flux, saturation temperature, spray flow rate, and nozzle height were investigated. Both standard-angle and wide-angle commercial nozzles were tested. The Nu data were correlated as a function of Re, Pr, reduced pressure, and heat flux. The heat transfer coefficient data of the low-fin tube are compared with those of a corrugated tube and plain tube.

Units: SI

Citation: Symposium, ASHRAE Transactions, 1998, Vol 104, pt. 1A, San Francisco